On 17/05/2011 11:12 AM, lowshoe wrote: > hi all, > i just switched from mod_php to mod_fcgid as we have a > multi-user-webserver and i wanted to use the benefits of per-user > executuion of php-scripts. > > now we have huge problems with the stability of the webserver.
This does not surprise me, once you get over 10 users with the fcgid defaults it's easy to whore a server. > the server has 16 GB RAM > after stating the webserver, 10GB of ram are immediately consumed. You must host many busy sites if they are mostly spawning processes right after restart. You might need to consider splitting them up over different boxes. > later (15-20min) the ram ist almost full and most of the > php-applications are not available anymore. > in the apache error.log i can then see the following error: > > Connection reset by peer: mod_fcgid: error reading data from FastCGI server > [error] [client x.x.x.x] Premature end of script headers: index.php You should track down exactly what is causing this, try strace or something. If you know exactly what is causing them to die you can tweak much more effectively. > this is my fcgid.conf: > DefaultMinClassProcessCount and DefaultMaxClassProcessCount are commented out set FcgidMinProcessesPerClass 0 and FcgidMaxProcessesPerClass to like 5 or 10. Watch the error log to see if it cries about not being able to spawn processes, bump if necessary. > in my top i see something like this: > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > 3510 user1 20 0 134m 10m 5472 S 35 0.1 0:07.07 php-cgi > 4402 user2 20 0 157m 22m 13m S 16 0.1 0:01.29 php-cgi > 3619 user3 20 0 153m 20m 15m S 6 0.1 0:01.28 php-cgi > 3609 user4 20 0 144m 21m 5632 S 4 0.1 0:00.39 php-cgi > [..] > 3623 userN 20 0 140m 18m 5708 S 4 0.1 0:00.47 php-cgi Yes you will have up to <virtual host or php wrapper> *FcgidMaxProcessesPerClass. default is 100 since you have not set it. > the fcgid-wrapper-script for each user looks like this: #!/bin/sh export PHPRC="/data/homewww/user1/conf/" export TMPDIR="/data/homewww/user1/tmp" export PHP_FCGI_CHILDREN=0 export PHP_FCGI_MAX_REQUESTS=10000 exec /opt/php/php-5.2/bin/php-cgi -c "/data/homewww/user1/conf/php.ini" $@ I'm just nitpicking. Don't quote me but I beleive PHPRC will overlay/override settings given with -c, so you could set defaults and allow clients to override. That said I haven't had to configure php in a while. > this is my apache2.conf: > <IfModule mpm_worker_module> > StartServers 2 > MinSpareThreads 25 > MaxSpareThreads 75 > ThreadLimit 64 > ThreadsPerChild 25 > MaxClients 150 > MaxRequestsPerChild 0 > </IfModule> event > worker, won't change memory usage much. > a also have aeccelerator enabled for each user. could this be the reason? disable eaccelerator for an hour and see what happens. If you need more specific help feel free to send me an email and we can work something out. Most of my consulting is "X server performance just went to shit after Y change. Fix it yesterday" Something else to note. I noticed you have php in /opt, which tells me you don't want your distro to play with your install. If your using a "enterprise" (old as shit) distro that can play a huge role in the way applications perform and the resources they use. Now obviously switching is not always an option. I got called in to "fix" a download mirror for a FPS game mod/map site. While on centos it would only put out a maximum of 15MB/s with lighty and randomly drop connections here and there. But after doing a takeover install remotely, the box now runs gentoo and happily puts out 35-38MB/s using apache with a lower loadavg (but more ram, apache is a bit of a pig). Point being, sometimes all the tricks in the world won't make a difference if your starting with crap. ------------------------------------------------------------------------------ What Every C/C++ and Fortran developer Should Know! Read this article and learn how Intel has extended the reach of its next-generation tools to help Windows* and Linux* C/C++ and Fortran developers boost performance applications - including clusters. http://p.sf.net/sfu/intel-dev2devmay _______________________________________________ Mod-fcgid-users mailing list Mod-fcgid-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mod-fcgid-users
